public static class FocusBehavior
{
private static Dictionary<UIElement, RoutedEventHandler> handlers = new Dictionary<UIElement, RoutedEventHandler>();
public static bool? GetIsFocused(DependencyObject obj)
{
return (bool?)obj.GetValue(IsFocusedProperty);
}
public static void SetIsFocused(DependencyObject obj, bool? value)
{
obj.SetValue(IsFocusedProperty, value);
}
public static readonly DependencyProperty IsFocusedProperty =
DependencyProperty.RegisterAttached(
"IsFocused",
typeof(bool?),
typeof(FocusBehavior),
new UIPropertyMetadata()
{
DefaultValue = null,
PropertyChangedCallback =
(s, e) =>
{
UIElement sender = (UIElement)s;
RoutedEventHandler x;
if (!handlers.TryGetValue(sender, out x))
{
Attach(sender);
}
if ((bool)e.NewValue)
{
sender.Focus();
Keyboard.Focus(sender);
}
}
});
private static void Attach(UIElement sender)
{
RoutedEventHandler handler = (s, e) =>
{
UIElement ui = (UIElement)s;
if (e.RoutedEvent == UIElement.GotFocusEvent)
{
ui.SetValue(IsFocusedProperty, true);
}
if (e.RoutedEvent == UIElement.LostFocusEvent)
{
ui.SetValue(IsFocusedProperty, false);
}
};
sender.GotFocus += handler;
sender.LostFocus += handler;
handlers.Add(sender, handler);
}
}注意引用名称空间
xmlns:localHelper="clr-namespace:Test.Helper"页面绑定此属性,注意需要双向绑定
<TextBox TabIndex="4" localHelper:FocusBehavior.IsFocused="{Binding ISFocusable5,Mode=TwoWay}"/>[参考]
C# WPF MVVM 实战 – 5- 用绑定，通过 VM 设置 View 的控件焦点
留待后查，同时方便他人